How Many Trees?

It may seem like planting a billion trees would help global warming because they absorb the greenhouse gas carbon dioxide during photosynthesis. But that would depend on the total number of trees on the planet, which was a number no one knew. Recently, researchers conducted a tree census that gathered the national forest inventories and tree information at a global scale. A previous estimate found 400 billion trees on Earth, but researchers discovered there were 390 billion in the Amazon basin alone. It took over two years to find a better estimate of the number of trees on the planet. Listen to this story to find out the results.

Related Current Events

A recent report shows carbon dioxide levels in the atmosphere rose at a record rate in 2013. Humans aren’t the only species affected by these changes. A new report by the National Audubon Society makes it clear that bird species in the U.S. and Canada are at risk of losing their habitats and potentially their lives due to climate change. Listen to this public radio story with your class to learn more about the links between changing temperatures and bird habitat and survival.

Is it fair to charge countries per carbon emission? Some leading researchers think so. They also believe that this could motivate countries to be more prepared for climate change and energy reductions.

There will be 30 million dead Christmas trees lining curbsides in the weeks after the holidays. However, they don’t just go to waste – many groups are finding environmental uses for former trees. Listen to this story to learn about the creative ways former Christmas trees impact the Earth.

Language Challenge Level

These levels of listening complexity can help teachers choose stories for their students. The levels do not relate to the content of the story, but to the complexity of the vocabulary, sentence structure and language in the audio story.

NOTE: Listenwise stories are intended for students in grades 5-12 and for English learners with intermediate language skills or higher.

Low

These stories are easier to understand and are a good starting point for everyone.

Medium

These stories have an average language challenge for students and can be scaffolded for English learners.

High

These stories have challenging vocabulary and complex language structure.